Playing against a Ferrer or against Federer/Murray is a completely different match.Against Ferrer,he is most on the offence,not really troubled by anything while against the other two he will have to deal with a different speed and pace.
For Djokovic it`s a bit similar to the Harrison match.When u don`t have to deal with big shots,it`s easier to play.

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Totally Agree. I was just exaggerating
But he is playing as if Ferrer is a Nobody.